Justification:
Listed as Data Deficient as the limits of distribution and population status of this species are unclear. It is a very poorly known taxon, and while it may be shown to more widely distributed than current information suggests, the presence of known threats, particularly hunting is of some concern. Further survey work is urgently needed to help determine the current status of this species.

This species is found south of the Congo River, in the central Congo Basin, where currently believed to be endemic to the Democratic Republic of the Congo. The precise northern, southern and eastern range limits are not fully known, but based on current records the western limit is the Congo River, the northern limit could be the Lulonga River, and the eastern limit the Lomami River (Gautier-Hion et al. 1999; Ehardt in press). Found up to 500 m asl.

This species occurs in seasonally inundated lowland and upland rain forest and may occur in gallery forest (Gautier-Hion et al. 1999); sometimes also recorded in secondary forest, and are apparently an agricultural pest in some areas. Diurnal species in which group size probably averages about 15 animals (Gautier-Hion et al. 1999), although J. Eriksson (in Ehardt in press) estimated group size at often more than 100 animals.

This species is listed on Appendix II of CITES and on Class B of the African Convention on the Conservation of Nature and Natural Resources. There are no confirmed records from Salonga National Park, although it has been recorded from near the south-west boundary and probably does occur (see Ehardt in press). Further studies into the limits of distribution, abundance, and threats to this species are needed.